CN113563507B - Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid - Google Patents
Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid Download PDFInfo
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Abstract
The invention discloses an anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing the anionic acrylamide polymer and respective preparation methods. The anionic acrylamide polymer is prepared by polymerizing an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer by an aqueous solution method. The polymer mainly comprises a C-C rigid main chain for improving the shearing resistance and the temperature resistance of a macromolecule, a sulfonic group for improving the salt resistance, a hydrophobic group for enhancing the hydrophobicity, a hydrolysis-resistant group for enhancing the stability of the macromolecule and a strong coordination group for enhancing instant crosslinking. The polymer can resist high temperature of 180 ℃, high-concentration divalent calcium ions and a metal cross-linking agent to form a weighted fracturing fluid system, and is applied to fracturing yield increase of three-super (super-high temperature, super-high pressure and super-deep) and one-low (low permeability) oil and gas reservoirs.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to an anionic acrylamide polymer, a calcium chloride weighted fracturing fluid containing the same and respective preparation methods thereof.
Background
In the efficient transformation process of the risk exploration well in the domestic important exploration field, the high-temperature high-pressure deep layer is always the important exploration field, and the limit burial depth of the reservoir depth is over 8000m. The depth of the target layer of the belt breakage of the Talima oilfield storehouse front Liu Chong is deeper and deeper, and the physical property condition of the reservoir is further deteriorated. And the gram depth is 13 and 9, the buried depth of the reservoir exceeds 8000m, the formation pressure is close to 140MPa, the formation temperature is close to 190 ℃, the matrix is more compact, and the heterogeneity of the natural fracture is stronger. Aiming at the fracturing transformation of the ultrahigh-temperature and ultrahigh-pressure reservoir, the power of a pump set of a fracturing truck reaches the limit, and the construction pressure is reduced by reducing the friction resistance of fracturing fluid. Therefore, the low-friction high-density fracturing fluid is used for improving the pressure of a hydrostatic column in a tubular column and relatively increasing the effective power of a ground pump set, and the method is the most effective method for fracturing the reservoir stratum.
The most commonly used thickening agents in the high-density weighted fracturing fluid are guar gum vegetable gum, a small amount of surfactant or polyacrylamide polymers, and the most commonly used weighting salts mainly comprise the following types: chlorides (mainly potassium chloride), nitrates (mainly sodium nitrate), formates (mainly potassium formate), bromides (mainly sodium bromide), and the like.
At present, in consideration of multiple factors such as weighting density, safety performance, corrosion performance, fracturing fluid cost and the like, the calcium chloride is selected as the weighting agent, and the density can reach 1.35g/cm 3 Low cost and good solubility. From the weighting agents commonly used in the past, it can be found that most of them are monovalent metal ion salts, and the influence on the performance of the fracturing fluid is relatively small. Calcium chloride is a divalent metal ion salt, and provides higher difficulty for the solubility, temperature resistance, crosslinkability and the like of the polymer. Therefore, the invention designs and synthesizes a divalent salt-resistant and high-temperature-resistant polyacrylamide product which is used as a thickening agent of the calcium chloride weighted fracturing fluid and can form a calcium chloride weighted fracturing fluid system with good temperature resistance and low cost.
Disclosure of Invention
The first purpose of the invention is to provide an anionic acrylamide polymer, which can resist high temperature of 180 ℃, high-concentration divalent calcium ions and can be crosslinked with a metal crosslinking agent to form a heavy fracturing fluid system, and the heavy fracturing fluid system is applied to fracturing yield increase of three-super (ultrahigh temperature, ultrahigh pressure and super-deep) and one-low (low permeability) oil-gas reservoirs.
A second object of the present invention is to provide a method for preparing more than one anionic acrylamide polymer.
A third object of the present invention is to provide a calcium chloride-weighted fracturing fluid comprising the above anionic acrylamide polymer.
The fourth purpose of the invention is to provide a preparation method of more than one calcium chloride weighted fracturing fluid.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an anionic acrylamide polymer, which is a high-concentration divalent salt-resistant and high-temperature-resistant polymer and is prepared by polymerizing an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer by an aqueous solution method;
the cationic monomer comprises: one or more of cetyl dimethyl ethyl ammonium chloride, dodecyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride and benzyl trimethyl ammonium chloride; the anionic monomers include: one or more of sodium 4-aminobenzenesulfonate, sodium p-styrene sulfonate, methacrylic acid, acrylonitrile, sodium p-toluenesulfinate and acrylamide; the nonionic monomer includes: one or more of N-vinyl pyrrolidone, N- [ tri (hydroxymethyl) methyl ] acrylamide, N-dimethylacrylamide and N, N-diethylacrylamide.
In the polymer, acrylamide has the functions of providing a C-C rigid main chain and an amido crosslinking group which can improve the shearing resistance and the temperature resistance of a high polymer and can also improve the resistance reduction rate; the cationic monomer has the functions of providing stronger solubility, structural viscosity and elasticity and enhancing structural stability; the function of the anionic monomer is to provide salt tolerance and thermal stability; the nonionic monomer has the function of improving the temperature resistance and salt tolerance of the thickening agent by utilizing the steric hindrance effect of the nonionic monomer.
The polymer mainly comprises a C-C rigid main chain for improving the shearing resistance and the temperature resistance of a macromolecule, a sulfonic group for improving the salt resistance, a hydrophobic group for enhancing the hydrophobicity, a hydrolysis-resistant group for enhancing the stability of the macromolecule and a strong coordination group for enhancing instant crosslinking.
In a preferred embodiment of the present invention, the raw materials in the aqueous solution polymerization process further comprise an initiator, a chain transfer agent and water;
the initiator comprises: one or the combination of more than two of sodium persulfate, potassium persulfate, ammonium persulfate and hydrogen peroxide; the chain transfer agent comprises one or the combination of more than two of sodium formate, sodium acetate, mercaptan and isopropanol.
In a preferred embodiment of the present invention, the acrylamide monomer is 15 to 25 wt%, the cationic monomer is 5 to 12wt.%, the anionic monomer is 8 to 15wt.%, the nonionic monomer is 1 to 5wt.%, the initiator is 0.01 to 0.1wt.%, the chain transfer agent is 0.05 to 0.2wt.%, and the balance water, based on 100% of the total weight of the acrylamide monomer, the cationic monomer, the anionic monomer, the nonionic monomer, the initiator, the chain transfer agent, and water.
In a preferred embodiment of the invention, the molecular weight of the polymer is from 400 to 600 ten thousand.
In a preferred embodiment of the present invention, the cationic monomer is hexadecyldimethylethyl ammonium chloride, the anionic monomer is sodium 4-aminobenzenesulfonate, the nonionic monomer is N-vinylpyrrolidone, the initiator is ammonium persulfate, and the chain transfer agent is mercaptan.
In a second aspect, the present invention provides a method for preparing one or more anionic acrylamide polymers, comprising the steps of:
1) Adding an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer into water, and adding a chain transfer agent;
2) Adjusting the pH and the temperature of a reaction system, and introducing protective gas; adding an initiator into the reaction system under the atmosphere of protective gas, and stopping introducing the protective gas after initiating the polymerization reaction;
3) Controlling the peak temperature of the reaction system to be less than 100 ℃, and continuing to react for 4-6h after the reaction system reaches the highest temperature to obtain a polymerization product which is in a gel state.
In a preferred embodiment of the present invention, in step 2), the pH is 6 to 7 and the temperature is 40 to 60 ℃.
In a preferable scheme of the invention, in the step 2), the protective gas is introduced for 15min, then the initiator is sequentially added into the reaction system every 5min, and the introduction of the protective gas is stopped after the polymerization reaction is initiated; the amount of initiator added at each time was 10% of its total amount.
The protective gas comprises nitrogen and inert gas, and the cheap nitrogen is generally adopted.
In a preferred embodiment of the present invention, the preparation method further comprises:
4) The resultant polymer gel was granulated by adding a dispersing agent, and then dried, pulverized and sieved.
In a preferred embodiment of the invention, the drying temperature is 50-70 ℃, and the particles with 80-120 meshes are crushed and sieved and reserved.
In a preferred embodiment of the present invention, the dispersing means comprises stearyl alcohol.
In a preferred embodiment of the present invention, the acrylamide monomer is prepared by the following microbiological method:
adding acrylonitrile into fermentation liquor with enough bacteria quantity to metabolize acrylonitrile universal for bacteria to generate acrylamide, and refining the generated acrylamide aqueous solution through membrane filtration and an ion exchange column to obtain the acrylamide monomer.
In a specific embodiment, the process for the microbiological preparation of acrylamide comprises:
firstly, carrying out three-stage amplification culture on special microbial bacteria, culturing the special microbial bacteria into fermentation liquor with sufficient bacteria quantity through a strain bottle, a seeding tank and a fermentation tank, transferring the fermentation liquor into a hydration catalytic reaction kettle, and adding acrylonitrile to enable the bacteria to metabolize the acrylonitrile to generate acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so that the acrylamide aqueous solution is required to be refined by membrane filtration and an ion exchange column and is finally produced.
The polymer of the invention is prepared by acrylamide produced by a microbiological method and polymer synthesized by an aqueous solution catalysis method to form an anionic high molecular polyacrylamide polymer with molecular weight of 400-600 ten thousand.
In a third aspect, the invention provides a calcium chloride weighted fracturing fluid, wherein a thickening agent in the calcium chloride weighted fracturing fluid comprises the anionic acrylamide polymer provided by the first aspect of the invention or the product obtained by the preparation method provided by the second aspect of the invention.
In a preferable embodiment of the invention, the calcium chloride aggravated fracturing fluid has a thickening agent concentration of 0.5-0.7% by volume.
The fourth aspect of the invention provides a preparation method of the calcium chloride weighted fracturing fluid, which comprises the following steps:
1) Adding 1-5% of the total amount of calcium chloride into water, and then adding the thickening agent and the cosolvent;
2) And adding the residual calcium chloride under the stirring state, and stirring until the calcium chloride is completely dissolved to obtain the calcium chloride weighted fracturing fluid with the preset density.
In a preferred embodiment of the present invention, the calcium chloride in step 1) is industrial calcium chloride dihydrate.
In a preferred embodiment of the present invention, the calcium chloride aggravated fracturing fluid has a cosolvent concentration of 0.1% by volume.
In order to meet the special requirements of high-valence salt resistance, high temperature resistance, low friction resistance, cross-linking and the like of the polymer, the invention synthesizes the high-concentration divalent salt resistant high-temperature polymer by adopting acrylamide monomers, cationic monomers, anionic monomers, nonionic monomers and the like; the calcium chloride high-valence salt water thickener not only provides the thickening performance of the solution, but also has good temperature resistance and shear resistance, thorough gel breaking and stable performance. The polymer thickening agent provided by the invention can form a weighted fracturing fluid system with the temperature resistance of 180 ℃ under the combined action of other additives for the weighted fracturing fluid, and the temperature of the weighted fracturing fluid system is 100s -1 The viscosity of the fracturing fluid is kept above 150 mPas after shearing for 120 minutes under the condition.
The polymer of the invention is mainly used as a thickening agent of heavy fracturing fluid, can be uniformly and quickly dissolved in high-concentration calcium chloride salt water, calcium chloride belongs to divalent salt, and the density of the salt water can reach 1.35g/cm 3 . Aiming at the yield increase transformation of a (ultra) deep layer, an (ultra) high pressure and high temperature reservoir stratum, under the condition that equipment and a pipe column are optimal, the most effective solution is to increase the density of fracturing fluid, improve the fluid injection pressure and reduce the construction risk. The polymer can form a calcium chloride weighted fracturing fluid system with stable performance, and has the advantages of temperature control delay crosslinking, high-concentration divalent ion salt resistance, shear resistance, complete gel breaking and the like under the high-temperature condition of 180 ℃ after being crosslinked with a special crosslinking agent for the calcium chloride weighted fracturing fluid.
Drawings
FIG. 1 shows the temperature and shear resistance of a fracturing fluid prepared from the polymer of example 1 of the present invention.
FIG. 2 shows the temperature and shear resistance of a fracturing fluid prepared from the polymer of example 2 of the present invention.
FIG. 3 shows the temperature and shear resistance of a fracturing fluid prepared from the polymer of example 3 of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The embodiment provides a high-concentration divalent salt and high-temperature resistant polymer and a production process thereof, wherein the preparation process comprises the following steps:
(1) Preparation process of acrylamide monomer
According to the process flow of acrylamide by a microbiological method, firstly, special microbial bacteria are subjected to three-stage amplification culture, fermentation liquor with enough bacteria quantity is cultured by a strain bottle, a seeding tank and a fermentation tank, and then the fermentation liquor is transferred into a hydration catalytic reaction kettle and added with acrylonitrile, so that the acrylonitrile which is commonly used by the bacteria is metabolized to generate the acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing polyacrylamide.
(2) Synthesis process of high-concentration divalent salt-resistant and high-temperature-resistant anionic acrylamide polymer
The anionic acrylamide polymer of the present example comprises the following raw materials, based on 100% of the total weight of the copolymerization components: 19% of acrylamide monomer, 6% of cationic monomer hexadecyl dimethyl ethyl ammonium chloride, 12% of anionic monomer 4-styrene sulfonic acid sodium salt, 4% of nonionic monomer N, N-dimethyl acrylamide, 0.03% of initiator ammonium persulfate, 0.1% of chain transfer agent sodium acetate and the balance of water.
The process comprises the following steps:
1) Mixing acrylamide monomer, cationic monomer, anionic monomer and nonionic monomer according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) Adjusting the pH value of the solution to 6-7; regulating the reaction temperature to 45 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the reaction system every 5min after 15min, and stopping nitrogen after initiation;
3) Controlling the peak temperature of the whole reaction system to be less than 100 ℃, and continuing to react for 4 h to discharge after the reaction of the reaction system reaches the highest temperature;
4) Transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, transferring into a drying bed, a pulverizer and a sieving machine to form a final required product, wherein the basic performance data are shown in table 1.
Example 2
The embodiment provides a high-concentration divalent salt and high-temperature resistant polymer and a production process thereof, wherein the preparation process comprises the following steps:
(1) Preparation process of acrylamide monomer
According to the process flow of acrylamide by a microbiological method, firstly, special microbial bacteria are subjected to three-stage amplification culture, fermentation liquor with enough bacteria quantity is cultured by a strain bottle, a seeding tank and a fermentation tank, and then the fermentation liquor is transferred into a hydration catalytic reaction kettle and added with acrylonitrile, so that the acrylonitrile which is commonly used by the bacteria is metabolized to generate the acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing polyacrylamide.
(2) Synthesis process of high-concentration divalent salt-resistant and high-temperature-resistant anionic acrylamide polymer
The anionic acrylamide polymer provided by this example comprises the following raw materials, by weight of 100% of the total weight of the copolymerization components: 22% of acrylamide monomer, 10% of cationic monomer hexadecyl dimethyl ethyl ammonium chloride, 8% of anionic monomer 4-styrene sulfonic acid sodium salt, 3% of nonionic monomer N, N-dimethyl acrylamide, 0.04% of initiator ammonium persulfate, 0.12% of chain transfer agent sodium acetate and the balance of water.
The process comprises the following steps:
1) Mixing acrylamide monomer, cationic monomer, anionic monomer and nonionic monomer according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) Adjusting the pH value of the solution to 6-7; regulating the reaction temperature to 50 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the sequential reaction system every 5min after 15min, and stopping nitrogen after initiation;
3) Controlling the peak temperature of the whole reaction system to be less than 100 ℃, and continuing to react 5 h after the reaction of the reaction system reaches the highest temperature;
4) Transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, transferring into a drying bed, a pulverizer and a sieving machine to form a final required product, wherein the basic performance data are shown in table 1.
Example 3
The embodiment provides a high-concentration divalent salt and high-temperature resistant polymer and a production process thereof, wherein the preparation process comprises the following steps:
(1) Preparation process of acrylamide monomer
According to the process flow of acrylamide by a microbiological method, firstly, special microbial bacteria are subjected to three-stage amplification culture, fermentation liquor with enough bacteria quantity is cultured by a strain bottle, a seeding tank and a fermentation tank, and then the fermentation liquor is transferred into a hydration catalytic reaction kettle and added with acrylonitrile, so that the acrylonitrile which is commonly used by the bacteria is metabolized to generate the acrylamide. The acrylamide aqueous solution produced later contains residual bacteria, residual acrylonitrile and other impurities, so membrane filtration and ion exchange columns are required for refining treatment, and the finally produced acrylamide aqueous solution is the main raw material for synthesizing polyacrylamide.
(2) Synthesis process of high-concentration divalent salt-resistant and high-temperature-resistant polymer
The anionic acrylamide polymer provided by this example comprises the following raw materials, by weight of 100% of the total weight of the copolymerization components: 22% of acrylamide monomer, 9% of cationic monomer hexadecyl dimethyl ethyl ammonium chloride, 9% of anionic monomer 4-styrene sulfonic acid sodium salt, 5% of nonionic monomer N, N-dimethyl acrylamide, 0.04% of initiator ammonium persulfate, 0.15% of chain transfer agent sodium acetate and the balance of water.
The process comprises the following steps:
1) The acrylamide monomer, the cationic monomer, the anionic monomer and the nonionic monomer are proportioned according to the proportion;
sequentially adding the proportioned monomers into quantitative deionized water to prepare a solution, and adding a required amount of chain transfer agent;
2) Adjusting the pH value of the solution to 6-7; adjusting the reaction temperature to 55 ℃, introducing nitrogen into the reaction system, adding 10 percent of the total amount of the initiator into the sequential reaction system every 5min after 15min, and stopping nitrogen after initiation;
3) Controlling the peak temperature of the whole reaction system to be less than 100 ℃, and continuing to react 5 h after the reaction of the reaction system reaches the highest temperature;
4) Transferring the polymerized discharged material into a granulator, adding a dispersed substance octadecanol, transferring into a drying bed, a pulverizer and a sieving machine to form a final required product, wherein the basic performance data are shown in table 1.
Example 4
In this embodiment, a calcium chloride-aggravated fracturing fluid is prepared, and for example, 1000mL of the calcium chloride-aggravated fracturing fluid with a density of 1.35mg/L is prepared, which includes the following steps:
1) 730mL of tap water is weighed and poured into a mixing and adjusting device, 10g of industrial calcium chloride dihydrate is added under the stirring state, and the dissolution is finished. The purpose of adding a small amount of calcium chloride dihydrate in advance is to prevent the polymer from having too high dissolution viscosity and being unfavorable for preparation;
2) Slowly adding a certain amount of the polymer (the polymer amount is calculated according to the volume ratio of the fracturing fluid, the polymer in the three embodiments is adopted for preparation, three solutions with the polymer volume concentration of 0.5%, 0.6% and 0.7% are respectively prepared), adding 0.1% of cosolvent, and stirring for 20 minutes;
3) Under the stirring state, 610g of industrial calcium chloride dihydrate is added; stirring until the calcium chloride is completely dissolved to form uniform calcium chloride weighted fracturing fluid.
The properties of the prepared calcium chloride weighted fracturing fluid are shown in table 1, the calcium chloride weighted fracturing fluid is crosslinked by a matched crosslinking agent, the temperature resistance and the shearing resistance are shown in fig. 1-3, and the temperature resistance is respectively 150 ℃, 160 ℃ and 170 ℃. The temperature resistance and the shear resistance curve show that the temperature resistance and the shear resistance are 100s -1 Under the condition, after 2 hours, the viscosity is more than 100mPa.s.
Table 1 basic properties of the polymers of examples 1-3 and the calcium chloride weighted fracturing fluid of the formulation of example 4
The dissolution times in the table refer to the dissolution times of the respective polymers in step 2) in example 4.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (14)
1. The anionic acrylamide polymer is characterized in that the anionic acrylamide polymer is used as a thickening agent in calcium chloride weighted fracturing fluid and is formed by polymerizing an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer by an aqueous solution method;
the cationic monomer is hexadecyl dimethyl ethyl ammonium chloride; the anion monomer is sodium p-styrene sulfonate; the nonionic monomer is N-vinyl pyrrolidone;
the raw materials in the polymerization process of the aqueous solution method also comprise an initiator, a chain transfer agent and water;
the total weight of the acrylamide monomer, the cationic monomer, the anionic monomer, the nonionic monomer, the initiator, the chain transfer agent and the water is 100%, the weight of the acrylamide monomer is 15-25 wt%, the weight of the cationic monomer is 5-12 wt%, the weight of the anionic monomer is 8-15 wt%, the weight of the nonionic monomer is 1-5 wt%, the weight of the initiator is 0.01-0.1 wt%, the weight of the chain transfer agent is 0.05-0.2 wt%, and the balance is water.
2. The anionic acrylamide polymer according to claim 1, wherein the initiator comprises: one or the combination of more than two of sodium persulfate, potassium persulfate, ammonium persulfate and hydrogen peroxide; the chain transfer agent comprises one or the combination of more than two of sodium formate, sodium acetate, mercaptan and isopropanol.
3. The anionic acrylamide polymer according to claim 1, wherein the initiator is ammonium persulfate and the chain transfer agent is a mercaptan.
4. A process for the preparation of the anionic acrylamide polymer according to any one of claims 1 to 3, characterized in that the process comprises the steps of:
1) Adding an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer into water, and adding a chain transfer agent;
2) Adjusting the pH and the temperature of a reaction system, and introducing protective gas; adding an initiator into the reaction system under the atmosphere of protective gas, and stopping introducing the protective gas after initiating the polymerization reaction;
3) Controlling the peak temperature of the reaction system to be less than 100 ℃, and continuing to react for 4-6h after the reaction system reaches the highest temperature to obtain a polymerization product.
5. The method according to claim 4, wherein the pH is 6 to 7 and the temperature is 40 to 60 ℃ in the step 2).
6. The preparation method according to claim 4, wherein in the step 2), the initiator is sequentially added into the reaction system every 5min after the protective gas is introduced for 15min, and the introduction of the protective gas is stopped after the polymerization reaction is initiated; the amount of initiator added at each time was 10% of its total amount.
7. The method of claim 4, further comprising:
4) The resultant polymer gel was added with a dispersing agent to granulate, followed by drying, pulverization, and sieving.
8. The method of claim 7, wherein the drying temperature is 50-70 ℃, and the particles with 80-120 meshes are crushed and sieved.
9. The method of claim 7, wherein the dispersing substance comprises stearyl alcohol.
10. The method according to any one of claims 4 to 9, wherein the acrylamide monomer is produced by the following microbiological method:
adding acrylonitrile into fermentation liquor with enough bacteria quantity to metabolize acrylonitrile universal for bacteria to generate acrylamide, and refining the generated acrylamide aqueous solution through membrane filtration and an ion exchange column to obtain the acrylamide monomer.
11. A calcium chloride-weighted fracturing fluid, wherein a thickening agent in the calcium chloride-weighted fracturing fluid comprises the anionic acrylamide polymer as defined in any one of claims 1 to 3 or a product obtained by the preparation method as defined in any one of claims 4 to 10; wherein the calcium chloride adopts industrial calcium chloride dihydrate.
12. A method for preparing the calcium chloride-weighted fracturing fluid of claim 11, wherein the method comprises the following steps:
1) Adding 1-5% of the total amount of calcium chloride into water, and then adding the thickening agent and the cosolvent;
2) Adding the residual calcium chloride under stirring, and stirring until the calcium chloride is completely dissolved to obtain the calcium chloride weighted fracturing fluid with the preset density;
the calcium chloride adopts industrial calcium chloride dihydrate.
13. The preparation method of claim 12, wherein the volume ratio concentration of the cosolvent in the calcium chloride weighted fracturing fluid is 0.1%.
14. The preparation method of claim 12, wherein the calcium chloride aggravated fracturing fluid has a thickening agent concentration of 0.5-0.7% by volume.
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